CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Qingyun He,Yaqian Zhang,Yanxia Yu,Ya Chen,Mengfeifei Jin,Enrou Mei,Xiaojuan Liang,Lanlan Zhai,Weidong Xiang
Here, Gd-doped CsPbBrI 2 nanocrystals (NCs) in borosilicate glass (B 2 O 3 -SiO 2 -ZnO) were successfully synthesized by the traditional melting quenching method. The optical properties of CsPbBrI 2 NCs@glasses at different heat treatment temperatures and the content of Gd 3+ were studied. It is found that CsPbBrI 2 NCs@glasses have greatly improved photoluminescence quantum yields (PLQYs) after doping (form 15.3% to 37%) and excellent hydrothermal and light stability. In addition, a white light emitting diode (WLED) was successfully prepared by combining Gd-doped CsPbBrI 2 NCs@glass and Ce 3+ : YAG phosphors with the blue light emitting diode (LED). After a series of adjustments, the high performance WLED device with a chromaticity coordinate (CIE) of (0.3340, 0.3386), luminous efficiency (LE) of 90.09 lm/W, correlated color temperature (CCT) of 5430 K and the color rendering index (CRI) of 81.4 was fabricated. This work provides a new strategy in the field of metal ion doped perovskite NCs for future reference and has potential applications in LEDs.
研究领域:
材料科学
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光学工程
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纳米技术
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Qiao Huang,Wenya Chen,Xiaojuan Liang,Chunyan Lv,Weidong Xiang
All-inorganic perovskite CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have generated significant attention in the emerging display industry because of their narrow-band emission, high color purity, and facile preparation and processing. By controlling the deposition of Ag nanoparticles in the B–Si–Zn glass matrix, CsPbBrI2 NC glass with significantly enhanced photoluminescence (PL) intensity (about 6.3 times) was successfully prepared, and the photoluminescence quantum yield (PLQY) is increased from 12.4% to 36.9%. More meaningfully, the high-performance glass powders were incorporated into polystyrene (PS) films through solution and blending techniques, and the films prepared by the latter had superior color coordinates and environmental stability, particularly the intense blue light stability. Under conditions of 60 °C, 90% relative humidity (RH), and 10 000 nit blue light irradiation for 40 d, the PL intensity decline rate of blended film does not exceed 5%. In addition, the light conversion film based on Ag@CsPbBrI2 glass with CsPbBr3 glass powders exhibits a wide color gamut of 125.2% of the NTSC 1953 standard, which shows richer colors than commercial displays on the liquid crystal display (LCD) screen, further opening the space for the development of the quantum dot film industry.
研究领域:
材料科学
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光电技术
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Ye He,Shouying Mu,Jing Ding,Xiaojuan Liang,Zhaopin Chen,Weidong Xiang
Perovskite quantum dots materials have achieved significant progress in the field of optoelectronics owing to their unique advantages, such as a wide color gamut, adjustable wavelength, and low cost. These advantages make them an ideal substitute for CdSe quantum dots in backlit display devices. As a kind of nanoparticles with a localized surface plasmon resonance effect, Au can be effectively used to enhance the photoluminescence of perovskite nanocrystals (NCs). In this study, Au nanoparticles were introduced into a borosilicate glass system with CsPbBrI 2 NCs to improve the optical properties . A series of Au@CsPbBrI 2 NCs glasses with tunable wavelengths in the range of 628–640 nm was successfully prepared. The photoluminescence quantum yield (PLQY) of the CsPbBrI 2 NCs glass was increased from 15% to 68% with the addition of AuBr 3. The Au@CsPbBrI 2 NC glass showed good aqueous, thermal, and blue light stabilities. Additionally, a backlight conversion film prepared by compounding the Au@CsPbBrI 2 NC glass powder exhibiting the optimal properties with polymethylmethacrylate (PMMA), was applied to a liquid crystal display (LCD). The presented image were more saturated and richer. Our results show that the optimized sample has immense potential for practical applications in the field of backlit displays.
研究领域:
材料科学
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光学工程
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 13
·5147-5154
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IF 8.067
Yanbin Chen,Hewei Yang,Jian Song,Bao Zhang
Doping metal ions into a perovskite lattice is an effective strategy for tailoring the intrinsic properties of perovskite nanocrystals (NCs). Herein, strong red-emitting and highly ambient and light stable Fe2+-doped CsPbBrI2 NCs with a maximum photoluminescence quantum yield (PLQY) of 92.1% were obtained. Systematic investigation of Fe2+ doping on the stability and the luminescence performance of CsPbBrI2 NCs was performed. Owing to the smaller ionic size compared to Pb2+, Fe2+ induced the lattice contraction and shortened the bond length of Pb–X, which suppressed the distortion of [PbX6]4− octahedra, thus improving the stability of CsPbBrI2 NCs. The champion sample could maintain up to 86% emission under the ambient conditions for 5 weeks. Besides, the incorporation of Fe2+ suppressed the formation of halide vacancies and optimized the relaxation process of CsPbBrI2, thereby contributing to the enhancement of PLQY. This facile Fe2+ doping method provides an effective strategy to synthesize stable and highly photoluminescent red perovskite materials.
研究领域:
材料科学
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光学
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DOI
高影响因子
NANOTECHNOLOGY
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2023
·Vol. 34
·期 27
·275201
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IF 3.5
Muhammad Amin Padhiar,Yongqiang Ji,Minqiang Wang,Shusheng Pan,Sayed Ali khan,Noor Zamin Khan,Lei Zhao,Fangrong Qin,Zhuan Zhao,Shaolin Zhang
Perovskite nanocrystals (NCs) feature adjustable bandgap, wide absorption range, and great color purity for robust perovskite optoelectronic applications. Nevertheless, the absence of lasting stability under continues energization, is still a major hurdle to the widespread use of NCs in commercial applications. In particular, the reactivity of red-emitting perovskites to environmental surroundings is more sensitive than that of their green counterparts. Here, we present a simple synthesis of ultrathin ZrO2 coated, Sr2+ doped CsPbBrI2 NCs. Introducing divalent Sr2+ may significantly eliminate Pb° surface traps, whereas ZrO2 encapsulation greatly improves environmental stability. The photoluminescence quantum yield of the Sr2+-doped CsPbBrI2/ZrO2 NCs was increased from 50.2% to 87.2% as a direct consequence of the efficient elimination of Pb° surface defects. Moreover, the thickness of the ZrO2 thin coating gives remarkable heat resistance and improved water stability. Combining CsPbSr0.3BrI2/ZrO2 NCs in a white light emitting diode (LED) with an excellent optical efficiency (100.08 lm W−1), high and a broad gamut 141% (NTSC) standard. This work offers a potential method to suppress Pb° traps by doping with Sr 2+and improves the performance of perovskite NCs by ultrathin coating structured ZrO2, consequently enabling their applicability in commercial optical displays.
研究领域:
材料科学
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光学工程
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纳米技术
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DOI
PubMed
高影响因子
Journal of Physical Chemistry C
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2022
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IF 4.177
Yongqiang Ji,Minqiang Wang,Zhi Yang,Hao Wang,Muhammad Amin Padhiar,Jindou Shi,Hengwei Qiu,Arshad Saleem Bhatti
Among the lead halide perovskites, the stability of red-emitting CsPbBrI2 perovskite quantum dots (PQDs) is very poor. This is an impediment to the development of high purity white emitting diodes (WLEDs) based on PQDs. Herein, we surprisingly find that luminescent properties of CsPbBrI2 PQDs can be significantly improved through doping of univalent Rb+ ions, especially when molar ratio of Rb+/Cs+ = 0.1/0.9. Subsequently, these red emitting Rb0.1Cs0.9PbBrI2 PQDs are successfully coated with TiO2 through an easy in situ strategy of adding titanium(IV) butoxide (TBO) to the precursor. Benefiting from the efficient protection of TiO2 nanoshell, these highly fluorescent Rb0.1Cs0.9PbBrI2/TiO2 nanocomposites can preserve their excellent red emitting characteristics even when directly immersed in water or exposed to illumination, enabling us to build highly stable WLEDs with color coordinates at (0.342, 0.325).
研究领域:
材料科学
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光学工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xintong Cao,Qiao Huang,Jiapeng Yang,Enrou Mei,Ye He,Xiaojuan Liang,Ruowang Liu,Weidong Xiang
All-inorganic CsPbX 3 (X=Cl, Br, I) perovskite quantum dots (QDs) have garnered extensive attention due to excellent optical properties. However, practical applications have been hampered by their instability. Dense amorphous glass protected CsPbX 3 perovskite QDs with excellent long-term stability are ideal conditions for developing high-quality liquid crystal displays (LCD). In this paper, CsPbBrI 2 QDs are precipitated in a novel aluminosilicate glass matrix. This work shows that the network structure of aluminosilicate glass is “modified” by Li 2 O. As the Li 2 O content increases, the glass network structure can be connected into a more aggregation state. This modification of Li 2 O increased the photoluminescence quantum yield (PLQY) of CsPbBrI 2 @glass (CPBI@G) from 22 % to 86 %. Surprisingly, CPBI@G exhibits excellent long-term stability against water, heat, and light. The specially designed CsPbX 3 @glass@PET light conversion film achieves a wide-color-gamut of 123.7 % of the NTSC 1953 standard. The film displays colors richer than commercial displays, paving the way for the commercial use of the CPBI@G nanocomposite in backlight displays.
研究领域:
材料科学
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光学工程
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高影响因子
Small
·
2025
·
IF 12.1
Bin Wang,Mulin Li,Junyi You,Fengyi Zhang,Rongqiu Lv,Weiwei Wang,Wenbin Zhou,Jun Chen,Haibo Zeng
Incorporating perovskite quantum dots (PQDs) into photoresist (PR) and utilizing mature photolithography processes is an optimal strategies for achieving patterning, perfectly aligning with the requirements for large-scale manufacturing. Consequently, enhancing the intrinsic stability of the red-emitting CsPbBrI 2 QDs is paramount to enable their direct mixing with PR for subsequent lithographic processing. Herein, a B-site-doped CsPbBrI 2 QD is designed by introducing Sr 2 ⁺. This doping enhances the lattice stability and partially repairs surface defects. The Sr-doped CsPbBrI 2 QDs solution maintains stability for 30 days, retaining 93.7% of its initial photoluminescence (PL) intensity with a PL peak barely shift, while the films show enhanced thermal tolerance. Owing to the high stability, the Sr-doped CsPbBrI 2 QDs are mixed with commercial PR, and the blend maintained a photoluminescence quantum yield (PLQY) of 61%. Photolithographic patterned films achieve the minimum feature size of 88.39 µm with better uniformity and luminescence intensity. Encapsulated within the PR matrix, the QD-PR films confer exceptional water stability, retaining strong luminescence even after 48 h immersion, and resistance to polar solvents. Sr-doped CsPbBrI 2 QDs and the commercial PR synergistically overcome compatibility barriers, facilitating simple and efficient photolithographic patterning.
研究领域:
材料科学
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纳米技术
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光电子学
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半导体器件
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光刻技术
✓ 已验证
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Wenya Chen,Qiao Huang,Qingyun He,Shun Cheng,Xiaojuan Liang,Zhaoping Chen,Weidong Xiang
Nowadays, an all-inorganic metal halide perovskite (CsPbX3, X = Cl, Br, and I) has shown excellent prospects in liquid crystal display (LCD) backlight device applications. However, in order to better meet the market’s development, the stability of CsPbX3 still remains an urgent problem to be solved. Herein, a heat-water cyclic process of CsPbBrI2 glass powder (RGP) designed to improve stability is proposed. Excitingly, the treated RGP shows better optical properties and heat resistance. Moreover, RGP@PS was prepared with high blue light, water, and heat stabilities. It is particularly noteworthy that RGP6@PS was continuously exposed for 268 h at 60 °C and 90% relative humidity in the blue light (447 nm, 880 W/m2) environment with no decrease in brightness. It illustrates that the CsPbX3 films have made an important breakthrough in stabilities. The LCD device based on RGP@CsPbBr3@PS was designed with a wider color gamut (126%) compared with NTSC 1953. This study explores a new strategy to improve the stability of CsPbX3 thin films for LCD light conversion films.
研究领域:
材料科学
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yanling Lin,Zhennan Wu,Enrou Mei,Jiapeng Yang,Ye He,Zhenbo Xu,Xiaojuan Liang,Xingen Hu,Ruowang Liu,Weidong Xiang
Perovskite quantum dots (QDs) have become the star material for liquid crystal display (LCD). However, instability affects its practical application. Herein, CsPbBrI 2 quantum dots (CsPbBrI 2 QDs) with high quantum efficiency have been successfully precipitated in situ by adding CaO to the Li-Al-Si glass substrate. The photoluminescence quantum yield (PLQY) was adjusted from 64.5 % to 87.5 %. At the same time, we adopted a new strategy of blue light irradiation-stirred water washing. When blue light irradiation and stirred water washing interact synergistically, the naked CsPbBrI 2 QDs detached from the glass surface, while smaller CsPbBrI 2 QDs continued to grow. This process successfully resulted in CsPbBrI 2 QDs with high luminescence intensity and high stability. Moreover, when exposed to 60 °C, 90 % relative humidity (RH), and 2000 nit blue light for 240 hours (h), the treated sample could retain 91.1 % of the original emission intensity. The color gamut of the prepared CsPbBrI 2 @CsPbBr 3 @glass@polystyrene (PS) light conversion film covered 122 % of the NTSC 1953 standard and 90 % of the Rec. 2020 standard. It provided great value for the commercialization of QDs in backlight display applications.
研究领域:
材料科学
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高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 7
·2530-2538
·
IF 7.393
Yao Tong,Mengfeifei Jin,Ya Chen,Yi Zhao,Haisheng Yang,Qin Wang,Lanlan Zhai,Xiaojuan Liang,Weidong Xiang
Lead halide perovskite CsPbX3 (X = Cl, Br, and I) nanocrystals (NCs) are widely used in the newest generation of lighting display equipment because of their excellent optical properties. However, their poor stability remains an urgent issue to overcome. Encapsulation has become a significant and effective strategy to promote the stability of perovskite NCs, particularly by the package coating of polymer and porous materials. Herein, a simple two-step encapsulation strategy is adopted to fabricate CsPbBrI2@zeolite/PMMA composite films to replace the previous preparation methods of perovskite films. A highly efficient and stable red-emitting material with great colour purity and excellent PLQY of ∼53.9% is manufactured by this simple and effective packaging method. Furthermore, because of the first-encapsulation with zeolite, the CsPbBrI2@zeoite/PMMA composite films not only reduced the agglomeration of NCs but also obtained better optical performance and environmental stability compared to that of pure CsPbBrI2/PMMA. Ultimately, WLEDs constructed by the red-emitting CsPbBrI2@zeolite/PMMA composite material achieve an outstanding colour rendering index, luminous efficiency and correlated color temperature (CRI = 94.5, LE = 77.22 lm W−1 and CCT = 5354 K), and realize tunable colour coordinates of (0.3359–0.32912, 0.3455–0.3336) in the white light area, implying that CsPbBrI2@zeolite/PMMA is very promising for obtaining a high CRI of WLEDs instead of traditional phosphor. The facile two-step encapsulation method proposed in this study provides a prospect for obtaining high-quality perovskites.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
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